Prediction of Flow Noise for Air Conditioning Duct

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Other Title
  • 空調用ダクトにおける流体音予測
  • 第 1 報－風洞実験による空調ダクト部材の音響特性
  • Part 1: Acoustic Characteristics of Air Conditioning Duct by Wind Tunnel Experiment

Abstract

The purpose of this study is to predict flow noise in an air conditioning duct system. Therefore, in this report, the acoustic characteristics of basic duct components are evaluated by wind tunnel experiments for comparing the accuracy of numerical analysis. The experiment was performed by using an anechoic room which can supply low noise air, then wind velocity, pressure and noise were measured in duct test pieces. As a result, a typical Aiolos tone and acoustic resonance were observed for the duct components of square cylinder and split type. For the noise generated by perforated metal, there is a strong correlation between the wind velocity passing through the hole and noise. Therefore, the result shows that flow noise can be substantially formulated by wind velocity.

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